* remove subdirectory backend
new handling as new submodule advotrackerd
* remove subdirectory frontend
new hanling as advotracker
* examples: example binaries
* locales: i18n definitions
* src/callbacks: rust state handling for widgets
* src/services: provide service methods (e.g import/export)
* src/widgets: handle frontend definitions
* src/data: provide test-data
Signed-off-by: Ralf Zerres <ralf.zerres@networkx.de>